José González

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Next generation tiled microarchitectures are going to be limited by off-chip misses and by on-chip network usage. Furthermore, these platforms will run an heterogeneous mix of applications with very different memory needs, leading to significant optimization opportunities. Existing adaptive memory hierarchies use either centralized structures that limit the(More)
We present a novel mechanism, called meeting point thread characterization, to dynamically detect critical threads in a parallel region. We define the critical thread the one with the longest completion time in the parallel region. Knowing the criticality of each thread has many potential applications. In this work, we propose two applications: thread(More)
Data dependencies have become one of the main bottlenecks of current superscalar processors. Data speculation is gaining popularity as a mechanism to avoid the ordering imposed by data dependencies. Loads and stores are very good candidates for data speculation since their effective address has a regular behavior and then, they are highly predictable. In(More)
This paper presents the Distributed Cooperative Caching, a scalable and energy-efficient scheme to manage chip multiprocessor (CMP) cache resources. The proposed configuration is based in the Cooperative Caching framework [3] but it is intended for large scale CMPs. Both centralized and distributed configurations have the advantage of combining the benefits(More)
A novel dynamic register renaming approach is proposed in this work. The key idea of the novel scheme is to delay the allocation of physical registers until a late stage in the pipeline, instead of doing it in the decode stage as conventional schemes do. In this way, the register pressure is reduced and the processor can exploit more instruction-level(More)
Power consumption and wire delays are two important limiting factors for current and forthcoming processors. Monolithic designs that keep reasonable power consumption and operate at high clock frequencies are ever harder to implement. In this paper we propose a novel multithreaded clustered microarchitecture that consists of a clustered front-end capable of(More)
Multicore architectures are becoming the main design paradigm for current and future processors. The main reason is that multicore designs provide an effective way of overcoming instruction-level parallelism (ILP) limitations by exploiting thread-level parallelism (TLP). In addition, it is a power and complexity-effective way of taking advantage of the huge(More)
Cache misses for which data must be obtained from a remote cache (cache-to-cache transfer misses) account for an important fraction of the total miss rate. Unfortunately, cc-NUMA designs put the access to the directory information into the critical path of 3-hop misses, which significantly penalizes them compared to SMP designs. This work studies the use of(More)
Instruction Level Parallelism (ILP) is one of the key issues to boost the performance of future generation processors. Data dependences may become one of the main bottlenecks that limit the performance of such future architectures due to the serialization that they introduce in the execution of programs. Data value speculation is a novel mechanism that may(More)
This work is focused on accelerating upgrade misses in cc-NUMA multiprocessors. These misses are caused by store instructions for which a read-only copy of the line is found in the L2 cache. Upgrade misses require a message sent from the missing node to the directory, a directory lookup in order to find the set of sharers, invalidation messages being sent(More)